Single-trigger device



t. 25, BS. I I F T, FAHLEN 2,134,504

' sINGLE-TRIGGER DEVICE Filed Oct. 22, 1956 3 Sheets-Sheet l 40ct. 25, was. p T, AMEN 2,134,604

SINGLE-TRIGGER DEVIC c.. 215, 1938. F, T FAHLEN A l 2,134,6@4

SINGLE-TRvIG-GER DEVICE Filed Oct. 22, 1956 3 Sheets-Shea?l 3 SECO/V0 Flll Patented Oct. 25, 1938 SIN GLE-TRIGGER DEVICE Frederick T. Fahlen, Phoenix, Ariz.

Application October 22,

14 Claims.

This invention relates to improvements in firearms, more especially in the trigger mechanism for the firing thereof, and its objects are as follows:

First, to provide a single-trigger device for double-trigger, double-barreled rearrns, which allows the firing of the shell in each barrel by the use of one and the same trigger, and to permit the shell in either barrel selected to be fired first.

Second, to provide a floating auxiliary sear for the foregoing purposes, said sear being unconnected to the receiver in which it mov-es back and forth between the triggers, only its form and frictional engagement with adjacent parts serving to hold it in place. v

Third, to provide a single-trigger device which is of the utmost simplicity, inasmuch as it consists of only two main parts (the auxiliary sear and its latch), which is capable of being incor- 29 porated in the gun without necessitating any substantial change in the gun, and which will not require nor cause any change in the action of the safety device.

Fourth, to provide a single-trigger device which insures certainty of action when operated, in that the arms of the auxiliary sear are constantly in position beneath the right and left trigger sears, thereby making said action more rigid and positive and, in addition, supplying the very important factor of increased leverage because of the length of the auxiliary sear and its iulcrum-position on the trigger plate of the receiver.

Fifth, to avoid the need of any inertia weight, friction cam or other mechanism to hold theI auxiliary sear prior to the second voluntary pull of the same trigger in firing the shell of the second barrel, this being accomplished by a shoulder on said auxiliary sear which engages the rear edge of the active trigger blade, or the sear or sear fingers in some guns, after the first pull.

Sixth, to provide an auxiliary sear for a singletrigger device, which is made to actuate both sears on the second voluntary trigger` pull because of at least one shoulder that it has coming into a bridging position in respect to the trigger blades or sears in the manner explained below.

Other objects and advantages will appear in the following specification, reference being had to the accompanying drawings in which:

Figure l is a side elevation of the receiver of a gun showing the parts in what is herein chosen as the first position wherein both hammers are cocked.

Figure 2 is a horizontal section taken on the line 2 2 of Fig. l.

Figure 3 is a longitudinal section taken substantially on the line 3 3 of Fig.l illustrating the rst pull of the right trigger.

Figure 4 is a front perspective View of the auxiliary sear.

1936, serial No. *107,071k

(C1. vL12- 42) Figure 4a is a rear perspective view of said sear.

Figure 5 is a side elevation of the gun receiver showing the change in position of the parts following the second pull of the right trigger.

Figure 6 is a similar view showing the effect of a rst pull ofthe left trigger. v

Figure 7- is a cross section taken on the line 1 1 of Fig. l.

Figure 8 is a cross section taken. on the line 8 8 of Fig. 1.`

Figure 9 is a cross section taken on the line 9 9 of Fig. 1.

Figure 101is a partially elevational and sectional view, logically iollowing Fig.` 5, but showing how the movement of the auxiliary sear may be limited by engagement with the trigger blades in some types of gun receivers.

Figure 1l is a partially elevational and. sectional view of another form of the invention wherein the structure is slightly modied but the principle is not altered in the least.

Figure l2 is a horizontal section taken substantially on the line |2 I2 of Fig. 11.

Figure 13 is a fractional side elevation of the construction in Fig. 11, illustrating the effect of the first pull of .the left trigger.

Figure 14 is a View similar to Fig. 13,` illustrating the effect of the secondpull of the left trigger.

Figure 1 5 is a cross section taken on the line |5-I5 of Fig. ll. f

Figure 16 is a detail perspective'view of the auxiliary sear in Figs. 11 to 14.

Figure 1'7 is a detail perspective view of the latch.

By way of a prefaceit is desired 'to state that the improved single-trigger device affords such regulation of the firing functions of the rearm that the chance of unintended double firing is reduced to a minimum. Said unintended double firing is caused by the recoil of the fire-arm immediately after the rst voluntary pull of the trigger. The gun travels backfaster than the finger can follow, allowing the trigger to be released. The almost instantly occurring forward reaction of the firearm `causes the trigger to press against the ringer so that an involuntary double fire occurs. This undesirable condition is relieved by the free-acting auxiliary sear and its arrangement of arms and shoulders, the details of which are fully brought out below.

In the drawings, I designates, generally, the receiver of a gun, in this instance the receiver of a double-barreled shotgun, the barrels and stock of which are omitted. 'Ihe known structure of this receiver comprises the following parts: the right (Fig. 3) and left (Figs. l, 5 and 6) 'harnmers 2, 3, right and left sears 3, 5 (Fig. 2) and the right and left triggers l.

Each of thehammers 2,".3 is spring-pressure operated, for whichv purpose each has a notch 8 at which one end of a heavy spring (not shown) is coupled, the opposite end of each spring being anchored in the forward end of the receiver. Each hammer also has a bottom shoulder 9 with which the respective sear engages when the hammer is cocked. The triggers 6, 1 are supported by a common pivot I6 which is held in a mount II that arises from the trigger plate I2. The blades I3, I4 of the right and left triggers Work in slots I5 (Figs. '1, 8 and 9) in this plate. The right and left trigger blades, I 3, I4 have heels I6, I1 respectively. l

The mount II has a hole I8 which contains a portion of and guides the rod I9 of the safety lever 20. The rod and lever are pivoted together at 2I, and the lever is pivoted to the trigger plate I2 at 22. The lever is operable by a finger-piece 23 on top of the receiver. Said finger-piece has combined with it a stout leaf spring 24, the latch 25 of which is adapted to occupyeither one of two notches 26, 21, respectively representingv the safety or non-shooting (dotted lines, Fig. l) and shooting (full lines, Figs. 1, 3, 5 and 6) positions of the finger-piece.

The rod I 9 has a hitherto solid lug 29. The cocking lever 30 has means 3| (Fig. 1) for cocking the hammers 2, 3 when turned inV one direction. Returning to the sears 4, 5 (Fig. 2), these are commonly pivoted at 32 to the receiver I. They extend backward beside the mount II, and terminate in inwardly directed fingers 33, 34. This ends the description of the known structure. The improvement comprises the following construction:

A number of differently directed spring pins 28 are formed on the safety lever 20. The foregoing lug 29 is forked at 29a (Fig. 9) to change it into the yoke shown for the purposes of the invention. The auxiliary sear, generally Vdesignated 35 (Fig. 4) consists of a body 36 from the lower portion of which a center rib 31 and lateral arms 38, 39 extend forwardly. v

The rib and arms are produced by slotting at 40 and 4I what would otherwise be a solid plate. The top surfaces of the elements 31, 38 and 39 are tapered at 42V to blunt points 43, the points of the arms 38, 39 constantly underlying the sear fingers 33, 34 (Fig. 2) so as always to beready for operation.

A slot 44 in the top of the body 36 (Fig. 4)` and the cutting away of the latter at 45 form a pair of shoulders 46, 41 which are adapted to engage the rear edges of the trigger blades I3, I4 (Figs. 3A and 6) as explained below, or the sears or sear fingers in some guns. I-Ioles 48, 49, or their equivalents, provide anchorages for the springs 50, 5I. Each of these is a push spring. 'Ihe spring 50 is secured to the preferred one of the pins 28. It can be made to abut some other solid part of the receiver, but here the safety lever is most convenient. In any event the function of the spring is to give the auxiliary sear 35 a forward push when permitted to do so.

A latch 52 tends to prevent movement of the auxiliary sear. The latch is pivoted at53 to and between the shoulders 46,41, occupying most of the slot 44 wherein it has a lug 54 which holds the spring 5I that presses upwardly against the latch 52. The spring turns the latch counterclockwise. Said latchV has a pair of vstuds 55, 56 adjacent to the body 36. a These studs coact with the respective trigger heels I6, I1 which they overlie (Fig. 2). TheV latch 52 occupies most of thespace (Fig. 3) in the yoke 29, and the latch is freely movable in this space,`both up and down and front and back, unless the fingerpece 23 is in the safety position (dotted lines, Fig. 1) when the yoke 29 obstructs the studs 55, 56. In this same position of the finger-piece the yoke 29 is directly over the trigger heels I6, I1,Y

preventing the .pulling of either trigger.

The free end of the latch is formed into a head 51 which is adapted to rest on the-center rib 31 of the auxiliary sear 35 when the mechanism is in the cocked and firing position (Fig. l). Said head has a'stop pin 58 (Fig. 3) which projects on each side (Fig. 2). 'Ihe stop pin engages behind the bases 59 of the trigger blades i3, I4 (or engages the equivalent of the mount II in some guns) when the mechanism is in the cocked and Vfiring position (Fig. 1), and the tops of the bases after either trigger is released after the first pull.

It so happens that the typeV of gun receiver shown in Figs. 1 to 9 includes the lug or yoke 29 which adapts itself to limiting the forward movement of the auxiliary sear 35. Out of a desire to make it plain that this circumstance may not occur in every type of gun receiver, attention is directed to Figurek 10 which is intended to illustrate how the same effect is accomplished otherwise. The structure here shown is identical in its main aspects with that already described, for which reason corresponding reference numerals are used without repeating the description.

Instead of having the pair of studs 55, 56 engage the yoke 29 or some equivalent of it, the front surfaces 60 of the auxiliary sear 35 are allowed to engage the rear of the trigger blades I3, I4.l It is conceivable that in some guns the auX- iliary sear may be stopped in its forward movement by the rear of the sear or sear ngers, as already suggested. To further illustrate the independence of the auxiliary sear from the safety device, the spring 5l! is shown abutting some solid part 6I of the gun receiver, other than the safety lever 20.

Attention isr nowY directed to Figs. 11 to 1'1 which illustrate a modification of the device in which the motion is reversed from that in the preceding form. This is a further exemplication of the fact that there can be considerable variation in the structure without altering the principle. The same reference numerals are used for the known receiver structure, only adding the exponent letter a for distinction between they two forms, there being additional known structure, to wit:

The pivot 62 of the safety lever 20a is carried by a box 63 which is set in the wooden stock (not shown) of the gun.V This lever is forked at 64. Said safety lever is operated above the pivot by a rod 65 which pushes the upper portion backward when the gun is cocked by use of the cooking lever 39a. Consequently the yoke 64 assumes the safety position (dotted lines, Fig. 11), making it necessary to slide the finger-piece 23a forwardly (full lines) before either trigger can be pulled.

A description of the so-called new structure in the modification follows: The mount IIa is recessed at 66 to seat a spring 61 which tends to push the auxiliary sear 35a backward. In this respect thebasic 'action is reversed from what'it is in Figs. 1 to 10, wherein the basic action under the pressure of the spring 56 is forward. The front edge of each sear finger 33a, 34n1 (Fig. 12) is beveled or rounded at 6B.

These bevels coact with the confronting beveled surface 69 on the shoulders 10, 1I of the body 35a. The latter is centrally divided at 12 (Fig. 16) to form the lateral arms 38a, 39a, the step-cuts in each of these providing stops 13, 14. The upper and lower surfaces 15, 16 provide rests as presently appears. The auxiliary sear has a center prong 11.

The latch 52a is now pivoted at 53a to a stud I8 which is fixed on the trigger plate 12a. The stop pin 58a, which is an embodiment of the earlier studs 55, 55 and stop pin 58, now appears in bent form (Fig. 17), the bending being required to enable coaction with the stops 13, 14 (Fig. 11). The ends of the stop pin rest on each of the upper and lower surfaces 15, T5, at different times (Figs. 13 and 14). The lug 53a retains the spring |a which now rests against the trigger plate l2a, the latch being carried by the latter instead of being an intimate part of the auxiliary sear.

The operation of the form in Figs. 1 to 9 is as follows: The position of the mechanism herein adopted as the first position, is that in which the hammers 2 and 3 are cocked, and either one of the triggers 5, 1 is free to be pulled because of finger-piece 23 having been moved forwardly to the shooting position. In cooking the rearm the action of the means 3| (Fig. 1) is to push back on the rod i9, moving the safety lever 20 and the iinger-piece 23 to the safety position (dotted lines). The same action moves the entire singletrigger device, consisting of the auxiliary sear 35 and its latch 52, backward because of the pressure of the yoke 2S against the studs 55, 56.

In the iirst position the stop pin 58 engages behind the trigger bases 59 (Fig. 2), having been urged to do so by the pressure of the spring 5l against the rear end of the latch 52 when the firearm was cocked. This engagement holds the auxiliary sear 35 against forward movement under pressure of the spring 50.

If it is desired to re the shell in the right barrel first, the right trigger 5 must be pulled first. If it is desired to re the shell in the left barrel rst, then the left trigger l must be pulled iirst, this constituting the selection of the barrel in which the shell shall be fired iirst. Suppose it is desired to fire the right shell first. The first pull of the right trigger (Fig. 3) rocks the right sear ii in the direction of the arrow a because of the pressure of the right trigger blade I3 against the sear iinger 33 at the arrow b. The right hammer 2 is released (arrow c) and the right shell is fired rst.

Upward pressure of the heel I6 against the stud 55 (arrow d, Fig. 3) turns the latch 52 clockwise against the tension of its spring 5|. The resulting release of the stop pin 58 from the bases 5S lets the spring 50 move the entire single-trigger device forward slightly. The engagement of the right shoulder 56 with the now raised heel I6 limits the movement. Some guns do not have the heels l, il of the trigger blades extending behind the sear fingers 33, 34 as in the instant description. In such cases the sear fingers 33, 34 play the part of the trigger blade heels, stopping the forward movement of the auxiliary sears by the engagement of one or the other of the shoulders 45, 'i with the respective sear fingers.

The operator keeps his iinger on the right trigger 5, but momentarily relaxes the pressure. The return of the trigger to its original position (into which both triggers are constantly urged by the pressure of unshown springs upon the right and left sears) lets the shoulder 45 pass over the heel I6, under influence of the spring 5l) which moves the Ventire"single-trigger device forward another step (Fig. 5), the auxiliary sear 35 now being within the range of movement of the triggers (Fig. 5), whereas initially it was not. This comprises the third position of the mechanism, and in it said device is limited by the engagement of the studs 55, 55 with the yoke 29. This limitation of the device is not necessarily performed by the yoke 29, although in the instant type of gun receiver it conveniently serves that purpose. In other gun receivers the limitation may be accemplished equally well by the rear of the trigger blades (Fig. 10), or either the sears or sear nngers in other types of gun receivers.

The stop pin 58 simply engages the'tops of the trigger bases 59 on which it pivots when the right trigger 6 is given the second pull (Fig. 5). In assuming the third position (Fig. 5), the lateral arms v38, 39, already part-way under the sears 5, are driven farther under the sear fingers 33, 34, making a snug t between the adjacent top surface of the trigger plate I2 and the nether surfaces of said sear fingers. This prevents lost motion.

Now when the right trigger is given said second pull (Fig. 5), the upward pressure of the heel I6 (arrow c) against the right shoulder li turns the entire single-trigger device on the fulcrum which the points 43 provide at f (Fig. 5). Both sears fi, 5 are turned on their pivot 32, but only the turning of the left sear 5 is now eiective. This releases the left hammer 3 (arrow y, Fig. 5) and the left shell is iired. The release of the right trigger by the operator lets the single-trigger device rest in the farthest forward position, in which it virtually is already, and this could be regarded as the first or starting position, had the cocked position in Fig. 1 not been so chosen before.

Thus the initial'pull of the right trigger iires the right shell rst, and its second pull res the left shell next. Had itbeen chosen to fire the left shell first, the left trigger l would have been initially pulled and the same principle of operation Vas with respect to the right trigger would have resulted. Notice the first pull of the left trigger 7 in Fig. 6. The left trigger heel I1 elevates the latch 52 by contact with the stud 56 as the left trigger blade i4 raises the left sear 5 to release the left hammer 3.

The position then assumed by the mechanism corresponds to position two (Fig. 3). The entire single-trigger device moves forward slightly until the left shoulder 41 engages the heel I1. Relaxation of inger-pressure on the left trigger will let the single-trigger device settle forward, thereby duplicating position three (Fig. 5) in readiness for the second left trigger pull.

Attention is now directed to Figs. 11 to 1'7 which illustrate the previously mentioned modification wherein the single-trigger device is impelled backward as firing progresses, instead of forward. Only the left trigger Ia is given consideration this time, the action of the right trigger being identical, as the reader doubtless understands by this time.

As seen in Fig. 11 the stop pins are at rest on the surfaces 15, the stops 13, M being pressed thereagainst by the spring 51. The shoulders T0, il are notl yet in position above the sear fingers 33a, 35a, but the latter bridge both arms 38a, 39a, and the respective right and left trigger blades l3, Ma.'

The first act is to pull the left trigger 'la (Fig. 13). Theleft trigger blade Ma lifts the sear inger 34a (arrow g), turning the left sear 58' and releasing the left hammer 3a (arrow h).

rEhe upward movement of the left trigger blade (arrow i) also lifts the latch 52a (arrow k) because of its catching under the nearest crooked Y stop pin 58a. Since the lower end of the latter is lifted above the stop 'I4 (Fig. 13) the spring E? expands a little, but only to the extent of pushing the auxiliary searV 35a rearward until beveled surface 69 of its shoulder 1I stops against the waiting sear finger 34a.

Now when finger-pressure on the left trigger is momentarily relaxed, the rear end of the -sear a will swing down until its finger 311a leaves contact with the shoulder 'Il and lines up with space therebeneath. The restriction on the spring 6i being removed, the latter is free to push the auxiliary sear 35ZL farther, this time until the body 36a engages the bevel 68 ofthe sear finger (in fact, both sear fingers), the position being well shown in Fig. 14 which, however, shows the next firing act.

Both sear fingers 33a, 34a are locked together by being caught under the shoulders lll, H (Fig. 16). It is easy to see that the second pull of the left trigger (Fig, 14) will cause its blade 14a to repeat what it did before, namely lift the sear finger 34, but because the two are locked together the right sear finger 33a will be lifted also, and this will release the right hammer 2a (Fig. 13). The entire auxiliary sear 35iL rises from the trigger plate i2a (Fig. 14), the attendant raising movement of the latch 52a merely being idle.

Upon recocking the two hammers by means of the lever 3ab (Fig. 11) the action on the rod 65 will be such as to turn the safety lever 2l]a into the dotted line position. Since the center prong il! is in the Way of the solid part of the safety lever, it follows that the auxiliary sear will be restored to its forward position where it becomes temporarily locked by the latch 52a dropping into its original place by the pressure of the spring ila (Fig. 11).

I claim: f

l. In a double-trigger, double-barreled firearm having a pressure-actuated hammer for each barrel and a sear to hold each hammer in a cocked position, an auxiliary sear having a portion constantly in position beneath the sears in Vreadiness for operation following the raising of one of the sears by a first pull on one of the triggers, means initially holding the auxiliary sear out of range of the raising movement of the triggers, said one trigger being adapted to be i, given a second pull, means comprising part of the respective triggers which then works to displace the previously stated holding means so as to remove the restriction on the auxiliary sear, and means to then move the auxiliary sear into range of the raising movement of both triggers and said portion farther under the sears so as to raise both sears with a lever-action upon said second pull.

2. In a double-trigger, double barreled rearm having a pressure-actuated hammer for each barrel and a sear to hold each hammer in a cocked position, an auxiliary sear having a portion constantly in position beneath the sears in readiness for operation following the raising of one of the sears by a first pull on one of the triggers, said one trigger being adapted to be given a second pull, a latch which initially holds the auxiliary sear out of range of the raising movement of the triggers, coacting means respectively on the triggers and on the latch, being mutually engaged on the first raising movement of the selected trigger to then displace the latch and free the auxiliary 'sear for subsequent movement, and a push-spring to then move the auxiliary sear into range of the raising movement of the triggers and said portion farther under the sears so as to raise both sears with a leveraction upon said second pull.

3. In a double-trigger,Y double-barreled firearm having a pressure-actuated hammer for each barrel and a sear to hold each hammer in a cocked position, an auxiliary sear having a portion constantly in position beneath the sears in readiness for operation following the raising of one of the sears by a first pull on the selected trigger, a latch movably carried by the auxiliary sear, means acting on the latch to make a part of the latch engage a part of at least one trigger thereby to initially hold the auxiliary sear out ofk push-spring to then move the auxiliary sear into range of the raising movement of the triggers and said portion farther under the sears so as to raise both sears with a lever-action'upon said second pull.

4. In a double-trigger, double-barreled rearm having `a pressure-actuated hammer for each barrel anda sear to hold each hammer in a cocked position, an auxiliary sear having arms partly in position constantly beneath the sears in readiness for operation following the raising of one of the sears by a first pull on the selected trigger, a shoulder on the auxiliary sear, a latch movably carried by the auxiliary sear, means acting on the latch to make a part of the latch engage a part of at least one trigger thereby to initially hold the auxiliary sear out of range of the raising movement of the triggers, said selected trigger being adapted to be given a second pull, coacting means respectively on the triggers and on the latch, being mutually engaged on the first raising movement of the selected trigger to displace the latch, a push-spring to then initially move the auxiliary sear until the shoulder abuts a part of the raised trigger, and means to limit the further movement of the auxiliary sear due to said spring to a position over said part of the selected trigger when let loose, said arms going farther under said sears upon said further movement of the auxiliary sear, the second pull of the selected trigger turning the auxiliary sear by pressure against a shoulder, the arms turning with a lever-action to raise both sears.

5. In combination with the yoke of a safety lever rod and a pair of triggers on each of which a hammer sear bears, a single-trigger device in unconnected and consequently floating operative relationship to the triggers and having means to temporarily engage a part of the seiected trigger upon pulling said trigger to raise the respective sear and preparatory to a subsequent second pull of the selected trigger, a spring to advance said device upon a momentary vrelaxation of linger-pressure on the selected trigger to a new position so that said means overlies the previously engaged part of the selected trigger, and means carried by said device engaging the yoke to stop the device in the new position, so that said device exercises a lever-action on both sears when the selected trigger is pulled the second time.

6. In combination with the trigger plate of a fire-arm receiver, trigger blades and hammer sears in position to be raised by the blades, said plate having a safety lever pivoted thereto, and having a pair of slots for said blades, an auxiliary sear in floating operative relationship to the trigger plate, safety lever, trigger blades and sears, said auxiliary sear consisting of a body having shoulders which are engageable by either trigger blade, a spring between the safety lever and body loosely pressing the body toward the trigger plate, and arms extending from the body close to the outsides of said trigger blades and beneath the sears.

7. In combination with the trigger plate of a rearm receiver, said plate having a safety lever pivoted thereto and having a pair of slots, a pair of triggers each of which has a blade occupying the respective slot, hammer sears in position to be raised by the blades, an auxiliary sear in oating operative relationship to the trigger plate, safety lever, trigger blades and hammer sears, said auxiliary sear consisting or a body having shoulders which are engageable by either trigger blade, a spring between the safety lever and body loosely pressing the body toward the trigger plate, arms extending from the body close to the outsides of said trigger blades and beneath the sears, a latch pivoted to the body, a spring tending to rock the latch in one direction, studs which are brought into positions for engagement by parts of the triggers due to said rocking, and a stop pin on the latch that is adapted to temporarily engage other parts of the triggers.

8. In a double-barrelled and double-triggered rearm, pressure-actuated parts which by their movement release a respective hammer, a single-trigger device by which to actuate the hammers serially, comprising a latch, stop means on the latch in an initially displaceable position in respect to said part, a shiftable auxiliary sear which is then held from shifting so that one part can be moved without aiecting the auxiliary sear, a shoulder on the auxiliary sear also held out of range of said part, and means to shift the auxiliary sear and aline the shoulder with both parts after displacement of the stop means by movement of said one part.

9. In a double-barrelled and double-triggered rearm, a single-trigger device comprising a latch, stop means on the latch in an initially engaging and displaceable position relative to the trigger blades, an auxiliary sear engaging the stop means thus being held away from the sears and against shifting, a shoulder on the auxiliary sear also held away from the sears, and means to shift the auxiliary sear and aline the shoulder with both sears after displacement of the stop means and latch by the first actuation of a selected trigger.

10. In a double-barrelled and double-triggered firearm, a single-trigger device comprising an auxiliary sear having sear-engaging shoulders and stop shoulders, a spring tending to push the auxiliary sear in one direction, a latch having stop means then engaged by the stop shoulders to check the auxiliary sear, sear i'lngers and trigger blades from which the sear-engaging shoulders are then held spaced, and means projecting from the auxiliary sear overlying the latch, being engageable by the latch to displace the auxiliary sear from said stop means.

1l. In a double-barrelled and double-triggered firearm having sear lingers superimposed upon the trigger blades, a single-trigger device comprising a latch, a pivotal support for the latch near one of its ends, stop means on the other end of the latch, superimposed on the trigger blades, a shiftable auxiliary sear having stops abutting the stop means and checking the auxiliary sear from shifting, shoulders on the auxiliary sear held away from the sear iingers, and means to shift the auxiliary sear and aline its shoulders with the sear fingers after displacement of the stop means from the auxiliary sear stop by the motion of a trigger wherein the latch is raised.

l2. In a double-barrelledand double-triggered y firearm, a single trigger device comprising a latch having stop means abutting one portion of the trigger blades andv studs within the range of movement of another portion of the trigger blades, a shiftable auxiliary sear having means pivotally carrying the latch, shoulders on the auxiliary sear held out of range of said other parts of the trigger blades, and means to shift the auxiliary sear and aline the shoulders with said other parts after displacement of the stop means by raising the latch through engagement of a stud by the depression of a selected trigger.

13. In a double-trigger, double-barreled rearm having a pressure actuated hammer for each barrel and a pivoted sear to hold each hammer in a cocked position, a single-trigger device comprising a body having a shoulder initially out of registration with a trigger blade, arms projecting from said body, having their fulcrum points initially partially disposed beneath the sears, and a spring which acts after the rst pull of one of the triggers to move said device so as to bring the shoulder within range of the trigger blade and the fulcrum points of said arms farther under the sears and closer to the pivots thereof, preparatory to a lever-action thereupon through the initial operation of the single-trigger device by a second pull of said one trigger.

14. In a gun having a safety lever rod movable in one direction to a safety position, a pair ofA triggers on each of which a hammer sear bears, and a portion depending from said rod; a single-trigger device movable to a set position by said depending portion when the rod is moved in said one direction, being unconnected and consequently in floating operative relationship to the triggers, means embodied in said device to temporarily engage a part of a selected trigger upon pulling said trigger to raise the respective hammer sear and preparatory to a subsequent second pull of the selected trigger, a spring to advance said device from its set position upon a momentary relaxation of finger-pressure on the selected trigger to a new position so that said means overlies the previously engaged part of the selected trigger, and means carried by said device then engaging the depending portion to stop the device in the new position preparatory to restoring the single-trigger device to its set position as the lever rod is counter-moved to its safety position after said device has exercised a lever-action on both sears when the selected trigger is pulled the second time.

FREDERICK T. FAHLEN. 

